<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 可以根据浏览器的协议去判断错误 -->
    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'">
    <link rel="stylesheet" href="./app.css">
    <title>Document</title>
   
</head>
<body>
    hello
    <input type="range">
    <button id="btn" >send</button>
    <script src="./renderer/app.js"></script>
</body>
</html>